Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 261

March 9, 201312 counties in Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 9, 2013, 3:34 PM CST for 12 counties in Oklahoma; 20 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Mar 9, 2013, 3:34 PM CST (21:34 UTC)
Expired: Mar 9, 2013, 5:00 PM CST
In force: 86 min
Issued by: the Storm Prediction Center

All 32 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Bosque County, TX, Brown County, TX, Coleman County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 84 km from the middle of the area, began a volume at 21:36 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.6 hours before the alert went out and 76 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 418 m²/s²
0-3 km storm-relative helicity: 599 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 8, 7:24 PM CST	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Harmon, Harper, Roger Mills and 1 more	96 min
Mar 8, 8:09 PM CST	Severe Thunderstorm Watch	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 3 more	7 hr
Mar 8, 11:33 PM CST	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 2 more	87 min
Mar 9, 2:39 AM CST	Mesoscale Discussion	SPC	Beaver, Beckham, Dewey, Ellis, Greer, Harmon and 5 more	66 min
Mar 9, 12:39 PM CST	Mesoscale Discussion	SPC	Carter, Comanche, Cotton, Garvin, Grady, Jefferson and 2 more	2 hr
Mar 9, 1:46 PM CST	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more	9 hr
Mar 9, 5:41 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Coal, Haskell, Hughes, Johnston and 6 more	94 min

Nearby

Mesoscale Discussions in Texas, 2013 Mesoscale Discussions in Oklahoma, 2013 Every mesoscale discussion in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.